The maximum number of routes in a Linux route table can be

It is a Mac that is looking for the next hop router

I really don't know, if the problem is closed, I won't be able to go back to you, so if no one answers, just give it to me.

Personally, it is understood as follows:

destination CIDR block or host.

gateway address, "* indicates that the target is the network to which the host belongs, and no route is required.

Genmask netmask.

flags tag. Some possible markings are as follows:

U—The route is active.

h—The target is a host.

g - The route points to the gateway.

r — Restores entries generated by dynamic routing.

d—Dynamically installed by the routed daemon.

m - Modified by the route's daemon.

Reject the route.

metric route distance, the number of relays required to reach the specified network (not used in the Linux kernel).

ref The number of route item references (not used in the Linux kernel).

use The number of times this route item was looked up by the routing software.

iface The output interface of the routing entry.

The first information in the routing table goes to the network segment, and the route goes to the device eth7, and so on.

It is originally the addressing range that comes with Windows, the purpose is to automatically assign IP addresses to all hosts in the local LAN when DHCP cannot obtain the IP, so that the server is not needed and only needs to be networked through the network cable. Linux also includes this routing address, presumably to be compatible with Windows.

The last route means that any information coming from a direction can go to any network.

14 NICs, of which eth7 has a gateway set and is the default egress.

1. Connect to the corresponding Linux host and enter the Linux command line state waiting for the shell command to be entered.

2. Enter the shell command on the Linux command line: route -n.

3. Press the "Enter key" on the keyboard to run the shell command, and you will see the routing table information of the system.

route --route

Or route -r

The system routing table information is listed.

netstat

Man Nestat takes a look at how it works.

Looked at your picture ......

The default route is.

It's the mask gateway

The above article means that you want to go anywhere from this IP so can you ping the same? 25 of this network segment.

But if you want to go to this segment without a route, he will also take the default route, so the ping can't get through.

route add mask

The meaning of this command is that if you want to go to this network segment, you have to go from this gateway linux for a long time, so try it......

Are the IP addresses of LAN1 and LAN1 CIDR blocks or IP addresses of STAs on the network?

Can you elaborate on that? For example, subnet masks.

Routing table ....Because the Linux system network card cannot be set up with two gateways at the same time, for example: one server two network cards, one telecom and one Unicom Telecom set the gateway, and China Unicom plays the routing table; If the network card of China Unicom is disabled, it can only take the default route, and China Unicom will not be connected; Otherwise, there is no telecommunication.

It's not a good idea.

And it's strange that you add this route, obviously you have a segment of the IP address, why do you go through the gateway?

ifcongfi to see, again, what is the IP of your gateway settings?

1 If you set the gateway on and you want to access the network segment, your route should be added like this: route add -net gw This is the gateway, not your eth1 IP).

The prerequisite is that your gateway has access to the CIDR block.

Use the route command to view the Linux kernel route table. The route command is used to operate kernel-based IP routing tables, and its main function is to create a static route for a specified host or network to pass through a network interface, such as eth0. When used"add"or"del"parameters, the route table is modified, and if there are no parameters, the current content of the route table is displayed.

The command format for setting the kernel routing table is:

# route [add|del] [net|-host] target [netmask nm] [gw gw] [dev] if]

To view a route table in Linux, perform the following steps:

The materials we need to prepare are: computer, Linux connection tool.

1. Connect to the Linux host and enter the command line state.

2. Enter route -n on the command line, and press enter.

3. At this time, all the routing tables will be printed out for viewing.

Instance 1: The current route is displayed.

route or route -n

The fourth line indicates that the purpose of the data transmission is to access the Internet, and the interface eth0 sends the packet to the gateway.

flags indicates the status of the current network node.

Note: route -n (-n means that the name is not resolved, and the listing speed will be faster than route).

After the introduction, we will explain how to access Linux on the internal network with SSH on the Internet.

Example 2: Add a gateway Set up a gateway.

Command: route add -net netmask dev eth0

Instance 3: Blocking a route.

Command: route add -net netmask reject

Instance 4: Deletes a route record.

Command: route del -net netmask route del -net netmask reject

Instance 5: Deleting and adding a default gateway

Command: Instance 6 SSH from the Internet to Access Linux-Intranet - Full Port Mapping Implementation:

Make sure that the intranet application is working properly.

Specify the Linux access address over the private network and ensure that the SSH service on the Linux server is normal.

Install the nat123 client Linux on the Linux server to be accessed and use it. Landing.

In the user center on the left, add port mappings. Select the full port mapping type. Enter the fixed-address port of Linux over the private network and the domain name for external access. You can use your own domain name or you can use a second-level domain name. Placing the mouse over the input box has a wizard prompt.

Instance 7: Install the nat123 client on the public network accessor and use the visitor.

The domain name and access port after the visitor opens the Linux full port mapping. If you select Allow LAN access when you add a destination port, you can access it within the visitor's LAN.

You can hover the mouse over the visitor icon to see the status prompt, whether it is normal or abnormal, there is a corresponding status detection prompt. If the port is open, the port can be accessed normally. If there are other abnormal prompts, they can also be solved according to the specific prompts.

When using the visitor natively, you can access Linux. The access address is the domain name port opened by a local visitor.

This configuration method is for servers, i.e. your Linux device is a server.

When external data accesses your server, it will resolve to your address through the operator's DNS, and if the other party is a telecom user, then it will naturally come in through the telecom line, which is your so-called tel network card. It's the same with Netcom.

When the external data accesses you, you will naturally respond to the external data, then the real role of this route comes out: the network card of the telecom comes in, then take the route of the telecom; Netcom's network card comes in, then take Netcom's route.